Experimental Study of Nonlinear Effects in Hydraulic Fracture Propagation

Pater, C.J. de; Weijers, Leen; Savić, Miloš; Wolf, Karl‐Heinz; Hoek, P.J. van den; Barr, D.T.

doi:10.2118/25893-pa

Cited by 44 publications

(23 citation statements)

References 10 publications

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“…Let us now turn to an experiment in cement, a material that is closer to rocks. Experiment COV12C was carried out at TU Delft and reported as test c12 in De Pater et al []. Evolution of the fracture front was measured using active acoustic scanning.…”

Section: Comparisons With Experimentsmentioning

confidence: 99%

Experiments versus theory for the initiation and propagation of radial hydraulic fractures in low‐permeability materials

et al. 2017

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We compare numerical predictions of the initiation and propagation of radial fluid‐driven fractures with laboratory experiments performed in different low‐permeability materials (PMMA, cement). In particular, we choose experiments where the time evolution of several quantities (fracture width, radius, and wellbore pressure) was accurately measured and for which the material and injection parameters were known precisely. Via a dimensional analysis, we discuss in detail the different physical phenomena governing the initiation and early stage of growth of radial hydraulic fractures from a notched wellbore. The scaling analysis notably clarifies the occurrence of different regimes of propagation depending on the injection rate, system compliance, material parameters, wellbore, and initial notch sizes. In particular, the comparisons presented here provide a clear evidence of the difference between the wellbore pressure at which a fracture initiates and the maximum pressure recorded during a test (also known as the breakdown pressure). The scaling analysis identifies the dimensionless numbers governing the strong fluid‐solid effects at the early stage of growth, which are responsible for the continuous increase of the wellbore pressure after the initiation of the fracture. Our analysis provides a simple way to quantify these early time effects for any given laboratory or field configuration. The good agreement between theoretical predictions and experiments also validates the current state of the art hydraulic fracture mechanics models, at least for the simple fracture geometry investigated here.

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Section: Comparisons With Experimentsmentioning

confidence: 99%

Experiments versus theory for the initiation and propagation of radial hydraulic fractures in low‐permeability materials

et al. 2017

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“…Previously, it was checked that during propagation these codes gave a consistent, correct description of laboratory tests for constant injection rate. 5 The differences in the numerical approaches of the three models become most apparent in the way the width of the fracture is related to the fluid pressure inside the fracture. Linear elasticity dictates that, for a radial fracture, the opening b, (at r D +r/r f ) is related to the net fluid pressure distribution p n by the following integral equation.…”

Section: Fig 1-acoustic Acquisition Geometry Of Test Snv03 With Tranmentioning

confidence: 99%

Physical and Numerical Modeling of Hydraulic Fracture Closure

Pater

Desroches

Groenenboom

et al. 1996

SPE Production &Amp; Facilities

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“…Results of several lab experiments conducted to study the tip effects in simulated in-si~u ~tress conditions in general agree with predictIOns based on LEFM without any additional tip effects. 29 The rate of fracture propagation (time effect) and the fracture size and large-scale formation heterogeneity (scale effect) are the main factors different in lab and field conditions. The role of these factors on HF process and its modeling needs to be discussed.…”

Section: Discussionmentioning

confidence: 99%

Review of recent developments in fracture mechanics with petroleum engineering applications

Shlyapobersky¹,

Chudnovsky²

1994

Proceedings of Rock Mechanics in Petroleum Engineering

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Basic concepts of fracture mechanics are discussed to analyze their applicability in modeling fracture initiation and propagation during hydraulic fracturing and waterflooding. Recent advances in modeling fracture initiation and quasi-equilibrium growth are reviewed. Special attention is given to the role of the process zone in fracturing. Process zone observed in laboratory and field hydraulic fracture experiments may explain the discrepancies between simulated and measured net fracture pressures. Process zone is revealed to be the common critical element for proposed mechanisms used for calibrating hydraulic fracture models. Deterministic and probabilistic mechanisms in fracture phenomena are addressed. Scale and rate effects are discussed.

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Experimental Study of Nonlinear Effects in Hydraulic Fracture Propagation

Cited by 44 publications

References 10 publications

Experiments versus theory for the initiation and propagation of radial hydraulic fractures in low‐permeability materials

Experiments versus theory for the initiation and propagation of radial hydraulic fractures in low‐permeability materials

Physical and Numerical Modeling of Hydraulic Fracture Closure

Review of recent developments in fracture mechanics with petroleum engineering applications

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